Crab fishing season begins and an eager new captain joins the fleet to fish bairdi for Sig. Meanwhile, Captain Keith Colburn arrives in Dutch Harbor reeling from problems in his personal life and Jonathan Hillstrand panics when he drops a pot before the legal start of the season.
Captain Sean Dwyer prepares the Brenna A. and his crew for the upcoming bairdi crab season he's handling for Sig Hansen. Meanwhile, Jake Anderson has second thoughts about hiring on a good friend with a bad attitude and Wild Bill is experiencing a similar problem with a new crew member aboard the Cape Caution.
Jake maneuvers the Saga through a risky strait which could jeopardize a million dollars worth of crab. Meanwhile, Josh and Casey perform rudimentary surgery on a deckhand and Captain Edgar breaks in his newest greenhorn who also happens to be his son.
Captain Sean Dwyer experiences his first spate of harsh weather as he struggles to fill Sig's quota of bairdi. On the Cape Caution, Wild Bill deals with empty pots and exhausted greenhorns whose fatigue could end up sinking the boat. Meanwhile, the Cornelia Marie captains worry they'll be fired when Casey gets sick and they fail to find crab.
The season’s worst storm yet slams the fleet. Freshmen Skipper Sean Dwyer must choose between crab and a childhood friend. Wild Bill questions his son's status as a crabber and man. As injuries stack up one deckhand reveals a painful secret in his pants.
A war erupts aboard the Northwestern when deckhands lose faith in their captain. Meanwhile, Jake Anderson has his own problems with drunk crew members who are no-shows during a critical boat maneuver. On the Brenna A, Sean is relieved that his greenhorn buddy Per is not seriously injured but the crew still harbors resentment toward him.
A monstrous arctic storm threatens to prevent the fleet from filling their crab quotas as the season draws to a close. Captain Sean Dwyer wrestles with the decision to keep fishing and risk disaster or return to Dutch a failure. Meanwhile, a power outage on the Cornelia Marie may signal a premature end to Josh Harris's remaining fishing days.
Opilio season is here, bringing the captains together to celebrate New Year's Eve. However, their good cheer is short-lived when news spreads of a mammoth winter storm looming at sea. Captain Jake Anderson is thrilled to have a veteran deckhand aboard the Saga but the man becomes problematic from the start. Meanwhile, the Northwestern takes a brutal hit from a rogue wave that damages the boat's bow and rattles Captain Sig.
Jake's deckhand puts the crew of the Saga at risk when he falls asleep during night watch. Meanwhile, Josh Harris suspects his deckhands are not counting the crab so he devises an unorthodox plan to fix the situation. On the Time Bandit, John Hillstrand has his biggest scare in years after a monster wave hits and he can't find one of his guys.
Captains Keith Colburn and Johnathan Hillstrand put their heads together to find the best crab hot spots. Wild Bill hopes son Zack will take the initiative and train his replacement on deck so he can get some time in the wheelhouse. On the Saga, Jake is still having trouble with his rogue deckhand but he needs the full cooperation of the crew to make his first offload date.
Winter weather thrashes the fleet as the captains race to catch up after a brutal crab season. Sig hopes to fill his quota by fishing in deeper waters but the crew pays the price. Captain Keith Colburn berates his Wizard greenhorns after they forget to put bait in the pots and Sean Dwyer channels his late father when laying down the law to a rebellious deckhand.
Sig welcomes daughter Mandy back to the Northwestern as a relief captain but disaster strikes when a fire breaks out hundreds of miles from land. On the Cornelia Marie, Josh takes the helm for the first time as he begins to fish for opilio and Sean Dwyer wrestles with how to discipline a deckhand who makes a critical mistake.
Captain Sig fights to save his crew when fire breaks out in the Northwestern's engine room. On the Saga, Jake Anderson's crew is in imminent danger due to a hydraulic system failure and Wild Bill's son Zack is in the hot seat as he tries to impress his father while at the helm. Meanwhile, Keith continues to struggle making quota and his incompetent deckhands are not helping the situation.
Captain Sig Hansen is medevaced to Anchorage after suffering a massive heart attack. On the Cape Caution, Wild Bill's growing frustration with son Zack's lack of ambition comes to a head when a dark secret is revealed. Meanwhile, Sean Dwyer realizes that several boats have followed the Brenna A. to the new fishing grounds which could mean he won't meet his quota.
Captain Johnathan Hillstrand gets a scare when his nephew is injured by a crab pot. On the Wizard, Monte Colburn feels the pressure after taking over for brother Keith who was unable to find crab while Sig Hansen takes the Northwestern back to port following a frightening engine room fire.
Zack Larson acts quickly when a rogue wave could spell death for a fellow deckhand. On the Cornelia Marie, Josh may have stumbled upon a strange anomaly that would fill his boat with crab in no time and Sig's daughter Mandy gets a navigation lesson in the Northwestern wheelhouse.
Captain Sig suffers a health scare that may end his season and possibly his career. On the Cape Caution, Wild Bill struggles to fix a water leak while over 200 miles from land and Jake Anderson hires on a good luck charm to help him finish out the Saga's season.